java - 位置需要许可

Question

我尝试制作一个使用位置的应用程序。当我想要位置更新时，会出现错误并显示“调用需要权限，可能会被用户拒绝:代码应显式检查权限是否可用(使用 checkPermission)或显式处理潜在的 SecurityException”

这就是我试图放入代码中的内容

if (ContextCompat.checkSelfPermission( this,android.Manifest.permission.ACCESS_COARSE_LOCATION ) != PackageManager.PERMISSION_GRANTED )
{
    ActivityCompat.requestPermissions(
        this,
        new String [] { android.Manifest.permission.ACCESS_COARSE_LOCATION },
        LocationService.MY_PERMISSION_ACCESS_COARSE_LOCATION
        );
    }

但是在我输入后，我在 LocationService 上收到一个错误，显示“无法解析符号 LocationService”。

这是我的代码

    public void onCreate() {

        Intent notificationIntent = new Intent(this, MainActivity.class);
        notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
        contentIntent = PendingIntent.getActivity(
                this, 0, notificationIntent, 0);

        //updateNotification(false);
        mLocationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        mLocationManager.addGpsStatusListener(this);
        mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 500, 0, this);

    }

Answer 1

在运行时请求许可以使用设备当前位置，如下所示:

    if (ActivityCompat.checkSelfPermission(YourActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(YourActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
          ActivityCompat.requestPermissions(YourActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
          return;
    }else{
      // Write you code here if permission already given.
        mLocationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        mLocationManager.addGpsStatusListener(this);
        mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 500, 0, this);
    } 

用户是否允许使用设备当前位置时进行处理:

       @Override
    public void onRequestPermissionsResult(int requestCode,
            String permissions[], int[] grantResults) {
               if (grantResults.length > 0  && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
        // Write you code here if permission already given.
        mLocationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        mLocationManager.addGpsStatusListener(this);
        mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 500, 0, this);
    }                           }else{
                            // you must ask location permission again
                            }
    }